A340728 - cp's OEIS frontend

A340728 a(n) is the number of divisors d of n such that n/d - d is prime.

n	a(n)
1	0
2	0
3	1
4	1
5	0
6	1
7	0
8	2
9	0
10	1
11	0
12	1
13	0
14	2
15	1
16	0
17	0
18	3
19	0
20	1
21	0
22	0
23	0
24	3
25	0
26	1
27	0
28	1
29	0
30	3
31	0
32	1
33	0
34	0
35	1
36	1
37	0
38	2
39	0
40	1
41	0
42	3
43	0
44	2
45	0
46	0
47	0
48	3
49	0
50	2
51	0
52	0
53	0
54	2
55	0
56	0
57	0
58	0
59	0
60	4
61	0
62	2
63	1
64	0
65	0
66	3
67	0
68	2
69	0
70	1
71	0
72	1
73	0
74	1
75	0
76	0
77	0
78	3
79	0
80	3
81	0
82	0
83	0
84	3
85	0
86	1
87	0
88	1
89	0
90	3
91	0
92	1
93	0
94	0
95	0
96	1
97	0
98	3
99	1

[0, 0, 1, 1, 0, 1, 0, 2, 0, 1, 0, 1, 0, 2, 1, 0, 0, 3, 0, 1, 0, 0, 0, 3, 0, 1, 0, 1, 0, 3, 0, 1, 0, 0, 1, 1, 0, 2, 0, 1, 0, 3, 0, 2, 0, 0, 0, 3, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 0, 4, 0, 2, 1, 0, 0, 3, 0, 2, 0, 1, 0, 1, 0, 1, 0, 0, 0, 3, 0, 3, 0, 0, 0, 3, 0, 1, 0, 1, 0, 3, 0, 1, 0, 0, 0, 1, 0, 3, 1]

cp's OEIS Frontend

A340728 a(n) is the number of divisors d of n such that n/d - d is prime.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	1
5	0
6	1
7	0
8	2
9	0
10	1
11	0
12	1
13	0
14	2
15	1
16	0
17	0
18	3
19	0
20	1
21	0
22	0
23	0
24	3
25	0
26	1
27	0
28	1
29	0
30	3
31	0
32	1
33	0
34	0
35	1
36	1
37	0
38	2
39	0
40	1
41	0
42	3
43	0
44	2
45	0
46	0
47	0
48	3
49	0
50	2
51	0
52	0
53	0
54	2
55	0
56	0
57	0
58	0
59	0
60	4
61	0
62	2
63	1
64	0
65	0
66	3
67	0
68	2
69	0
70	1
71	0
72	1
73	0
74	1
75	0
76	0
77	0
78	3
79	0
80	3
81	0
82	0
83	0
84	3
85	0
86	1
87	0
88	1
89	0
90	3
91	0
92	1
93	0
94	0
95	0
96	1
97	0
98	3
99	1

n	a(n)
1	0
2	0
3	1
4	1
5	0
6	1
7	0
8	2
9	0
10	1
11	0
12	1
13	0
14	2
15	1
16	0
17	0
18	3
19	0
20	1
21	0
22	0
23	0
24	3
25	0
26	1
27	0
28	1
29	0
30	3
31	0
32	1
33	0
34	0
35	1
36	1
37	0
38	2
39	0
40	1
41	0
42	3
43	0
44	2
45	0
46	0
47	0
48	3
49	0
50	2
51	0
52	0
53	0
54	2
55	0
56	0
57	0
58	0
59	0
60	4
61	0
62	2
63	1
64	0
65	0
66	3
67	0
68	2
69	0
70	1
71	0
72	1
73	0
74	1
75	0
76	0
77	0
78	3
79	0
80	3
81	0
82	0
83	0
84	3
85	0
86	1
87	0
88	1
89	0
90	3
91	0
92	1
93	0
94	0
95	0
96	1
97	0
98	3
99	1

n	a(n)
1	0
2	0
3	1
4	1
5	0
6	1
7	0
8	2
9	0
10	1
11	0
12	1
13	0
14	2
15	1
16	0
17	0
18	3
19	0
20	1
21	0
22	0
23	0
24	3
25	0
26	1
27	0
28	1
29	0
30	3
31	0
32	1
33	0
34	0
35	1
36	1
37	0
38	2
39	0
40	1
41	0
42	3
43	0
44	2
45	0
46	0
47	0
48	3
49	0
50	2
51	0
52	0
53	0
54	2
55	0
56	0
57	0
58	0
59	0
60	4
61	0
62	2
63	1
64	0
65	0
66	3
67	0
68	2
69	0
70	1
71	0
72	1
73	0
74	1
75	0
76	0
77	0
78	3
79	0
80	3
81	0
82	0
83	0
84	3
85	0
86	1
87	0
88	1
89	0
90	3
91	0
92	1
93	0
94	0
95	0
96	1
97	0
98	3
99	1